001/*
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 */
019package org.nuxeo.ecm.automation.core.scripting;
020
021/**
022 * @author <a href="mailto:[email protected]">Bogdan Stefanescu</a>
023 */
024public class Functions {
025
026    private static volatile Object fn = new CoreFunctions();
027
028    private Functions() {
029    }
030
031    public static void setInstance(Object fn) {
032        if (fn == null) {
033            fn = new CoreFunctions();
034        }
035        synchronized (Functions.class) {
036            Functions.fn = fn;
037        }
038    }
039
040    public static Object getInstance() {
041        Object o = fn;
042        if (o == null) {
043            synchronized (Functions.class) {
044                o = new CoreFunctions();
045                fn = o;
046            }
047        }
048        return o;
049    }
050
051}